Israel's Mossad is thought by many to be one of the most powerful intelligence agencies in the world. In Man in the Shadows, Efraim Halevy--a Mossad officer since 1961 and its chief between 1998 and 2002--provides an unprecedented portrait of the Middle East crisis. Having served as the secret envoy of prime ministers Rabin, Shamir, Netanyahu, Barak, and Sharon, Halevy was privy to many of the top-level negotiations that determined the progress of...